Mercurial > libervia-backend

annotate sat/plugins/plugin_misc_ip.py @ 2681:263a00e90174

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jp (info): replaced "Client" by the more generic "Software"
author Goffi <goffi@goffi.org>
date Thu, 27 Sep 2018 08:51:01 +0200
parents 56f94936df1e
children 003b8b4b56a7
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1934
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for IP address discovery
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5 # Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from sat.core.i18n import _, D_
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21 from sat.core.constants import Const as C
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22 from sat.core.log import getLogger
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23
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24 log = getLogger(__name__)
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25 from sat.tools import xml_tools
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26 from twisted.web import client as webclient
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27 from twisted.web import error as web_error
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28 from twisted.internet import defer
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29 from twisted.internet import reactor
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30 from twisted.internet import protocol
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31 from twisted.internet import endpoints
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32 from twisted.internet import error as internet_error
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33 from zope.interface import implements
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34 from wokkel import disco, iwokkel
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35 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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36 from twisted.words.protocols.jabber.error import StanzaError
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37 import urlparse
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38
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39 try:
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40 import netifaces
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41 except ImportError:
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42 log.warning(
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43 u"netifaces is not available, it help discovering IPs, you can install it on https://pypi.python.org/pypi/netifaces"
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44 )
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45 netifaces = None
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46
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47
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48 PLUGIN_INFO = {
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49 C.PI_NAME: "IP discovery",
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50 C.PI_IMPORT_NAME: "IP",
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51 C.PI_TYPE: C.PLUG_TYPE_MISC,
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52 C.PI_MODES: C.PLUG_MODE_BOTH,
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53 C.PI_PROTOCOLS: ["XEP-0279"],
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54 C.PI_RECOMMENDATIONS: ["NAT-PORT"],
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55 C.PI_MAIN: "IPPlugin",
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56 C.PI_HANDLER: "yes",
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57 C.PI_DESCRIPTION: _("""This plugin help to discover our external IP address."""),
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58 }
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59
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60 # TODO: GET_IP_PAGE should be configurable in sat.conf
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61 GET_IP_PAGE = (
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62 "http://salut-a-toi.org/whereami/"
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63 ) # This page must only return external IP of the requester
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64 GET_IP_LABEL = D_(u"Allow external get IP")
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65 GET_IP_CATEGORY = "General"
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66 GET_IP_NAME = "allow_get_ip"
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67 GET_IP_CONFIRM_TITLE = D_(u"Confirm external site request")
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68 GET_IP_CONFIRM = D_(
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69 u"""To facilitate data transfer, we need to contact a website.
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70 A request will be done on {page}
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71 That means that administrators of {domain} can know that you use "{app_name}" and your IP Address.
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72
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73 IP address is an identifier to locate you on Internet (similar to a phone number).
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74
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75 Do you agree to do this request ?
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76 """
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77 ).format(
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78 page=GET_IP_PAGE, domain=urlparse.urlparse(GET_IP_PAGE).netloc, app_name=C.APP_NAME
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79 )
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80 NS_IP_CHECK = "urn:xmpp:sic:1"
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81
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82 PARAMS = """
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83 <params>
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84 <general>
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85 <category name="{category}">
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86 <param name="{name}" label="{label}" type="bool" />
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87 </category>
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88 </general>
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89 </params>
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90 """.format(
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91 category=GET_IP_CATEGORY, name=GET_IP_NAME, label=GET_IP_LABEL
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92 )
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93
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94
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95 class IPPlugin(object):
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96 # TODO: refresh IP if a new connection is detected
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97 # TODO: manage IPv6 when implemented in SàT
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98
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99 def __init__(self, host):
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100 log.info(_("plugin IP discovery initialization"))
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101 self.host = host
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102 host.memory.updateParams(PARAMS)
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103
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104 # NAT-Port
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105 try:
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106 self._nat = host.plugins["NAT-PORT"]
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107 except KeyError:
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108 log.debug(u"NAT port plugin not available")
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109 self._nat = None
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110
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111 # XXX: cache is kept until SàT is restarted
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112 # if IP may have changed, use self.refreshIP
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113 self._external_ip_cache = None
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114 self._local_ip_cache = None
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115
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116 def getHandler(self, client):
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117 return IPPlugin_handler()
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118
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119 def refreshIP(self):
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120 # FIXME: use a trigger instead ?
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121 self._external_ip_cache = None
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122 self._local_ip_cache = None
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123
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124 def _externalAllowed(self, client):
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125 """Return value of parameter with autorisation of user to do external requests
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126
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127 if parameter is not set, a dialog is shown to use to get its confirmation, and parameted is set according to answer
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128 @return (defer.Deferred[bool]): True if external request is autorised
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129 """
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130 allow_get_ip = self.host.memory.params.getParamA(
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131 GET_IP_NAME, GET_IP_CATEGORY, use_default=False
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132 )
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133
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134 if allow_get_ip is None:
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135 # we don't have autorisation from user yet to use get_ip, we ask him
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136 def setParam(allowed):
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137 # FIXME: we need to use boolConst as setParam only manage str/unicode
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138 # need to be fixed when params will be refactored
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139 self.host.memory.setParam(
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140 GET_IP_NAME, C.boolConst(allowed), GET_IP_CATEGORY
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141 )
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142 return allowed
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143
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144 d = xml_tools.deferConfirm(
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145 self.host,
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146 _(GET_IP_CONFIRM),
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147 _(GET_IP_CONFIRM_TITLE),
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148 profile=client.profile,
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149 )
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150 d.addCallback(setParam)
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151 return d
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152
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153 return defer.succeed(allow_get_ip)
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154
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155 def _filterAddresse(self, ip_addr):
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156 """Filter acceptable addresses
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157
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158 For now, just remove IPv4 local addresses
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159 @param ip_addr(str): IP addresse
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160 @return (bool): True if addresse is acceptable
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161 """
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162 return not ip_addr.startswith("127.")
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163
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164 def _insertFirst(self, addresses, ip_addr):
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165 """Insert ip_addr as first item in addresses
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166
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167 @param ip_addr(str): IP addresse
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168 @param addresses(list): list of IP addresses
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169 """
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170 if ip_addr in addresses:
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171 if addresses[0] != ip_addr:
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172 addresses.remove(ip_addr)
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173 addresses.insert(0, ip_addr)
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174 else:
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175 addresses.insert(0, ip_addr)
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176
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177 def _getIPFromExternal(self, ext_url):
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178 """Get local IP by doing a connection on an external url
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179
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180 @param ext_utl(str): url to connect to
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181 @return (D(str)): return local IP
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182 """
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Goffi <goffi@goffi.org>
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183 url = urlparse.urlparse(ext_url)
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184 port = url.port
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185 if port is None:
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186 if url.scheme == "http":
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187 port = 80
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188 elif url.scheme == "https":
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189 port = 443
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190 else:
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191 log.error(u"Unknown url scheme: {}".format(url.scheme))
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192 defer.returnValue(None)
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193 if url.hostname is None:
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194 log.error(u"Can't find url hostname for {}".format(GET_IP_PAGE))
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195
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196 point = endpoints.TCP4ClientEndpoint(reactor, url.hostname, port)
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197
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198 def gotConnection(p):
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199 local_ip = p.transport.getHost().host
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200 p.transport.loseConnection()
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201 return local_ip
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202
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diff changeset
203 d = endpoints.connectProtocol(point, protocol.Protocol())
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204 d.addCallback(gotConnection)
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205 return d
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206
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diff changeset
207 @defer.inlineCallbacks
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208 def getLocalIPs(self, client):
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209 """Try do discover local area network IPs
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210
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211 @return (deferred): list of lan IP addresses
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diff changeset
212 if there are several addresses, the one used with the server is put first
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213 if no address is found, localhost IP will be in the list
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214 """
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diff changeset
215 # TODO: manage permission requesting (e.g. for UMTS link)
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216 if self._local_ip_cache is not None:
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217 defer.returnValue(self._local_ip_cache)
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218 addresses = []
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219 localhost = ["127.0.0.1"]
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220
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diff changeset
221 # we first try our luck with netifaces
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222 if netifaces is not None:
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223 addresses = []
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diff changeset
224 for interface in netifaces.interfaces():
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225 if_addresses = netifaces.ifaddresses(interface)
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diff changeset
226 try:
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diff changeset
227 inet_list = if_addresses[netifaces.AF_INET]
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diff changeset
228 except KeyError:
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diff changeset
229 continue
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diff changeset
230 for data in inet_list:
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231 addresse = data["addr"]
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diff changeset
232 if self._filterAddresse(addresse):
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233 addresses.append(addresse)
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diff changeset
234
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Goffi <goffi@goffi.org>
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235 # then we use our connection to server
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diff changeset
236 ip = client.xmlstream.transport.getHost().host
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diff changeset
237 if self._filterAddresse(ip):
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238 self._insertFirst(addresses, ip)
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diff changeset
239 defer.returnValue(addresses)
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240
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Goffi <goffi@goffi.org>
parents: 1566
diff changeset
241 # if server is local, we try with NAT-Port
1537
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diff changeset
242 if self._nat is not None:
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diff changeset
243 nat_ip = yield self._nat.getIP(local=True)
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diff changeset
244 if nat_ip is not None:
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diff changeset
245 self._insertFirst(addresses, nat_ip)
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diff changeset
246 defer.returnValue(addresses)
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diff changeset
247
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Goffi <goffi@goffi.org>
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diff changeset
248 if addresses:
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Goffi <goffi@goffi.org>
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diff changeset
249 defer.returnValue(addresses)
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diff changeset
250
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diff changeset
251 # still not luck, we need to contact external website
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252 allow_get_ip = yield self._externalAllowed(client)
1537
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253
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Goffi <goffi@goffi.org>
parents: 1566
diff changeset
254 if not allow_get_ip:
d5f59ba166fe plugins IP: getLocalIPs now return localhost IP instead of an empty list if no non-localhost ip can be found
Goffi <goffi@goffi.org>
parents: 1566
diff changeset
255 defer.returnValue(addresses or localhost)
1537
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diff changeset
256
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Goffi <goffi@goffi.org>
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diff changeset
257 try:
eb8aae35085b plugin ip: local ip cache + DNS error detection
Goffi <goffi@goffi.org>
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diff changeset
258 ip_tuple = yield self._getIPFromExternal(GET_IP_PAGE)
1566
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parents: 1555
diff changeset
259 except (internet_error.DNSLookupError, internet_error.TimeoutError):
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diff changeset
260 log.warning(u"Can't access Domain Name System")
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Goffi <goffi@goffi.org>
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diff changeset
261 defer.returnValue(addresses or localhost)
1537
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diff changeset
262 self._insertFirst(addresses, ip_tuple.local)
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diff changeset
263 defer.returnValue(addresses)
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diff changeset
264
6fa9e8c02c34 plugin IP discovery: better IP discovering:
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diff changeset
265 @defer.inlineCallbacks
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diff changeset
266 def getExternalIP(self, client):
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267 """Try to discover external IP
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268
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diff changeset
269 @return (deferred): external IP address or None if it can't be discovered
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parents:
diff changeset
270 """
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diff changeset
271 if self._external_ip_cache is not None:
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diff changeset
272 defer.returnValue(self._external_ip_cache)
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273
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274 # we first try with XEP-0279
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275 ip_check = yield self.host.hasFeature(client, NS_IP_CHECK)
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276 if ip_check:
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277 log.debug(u"Server IP Check available, we use it to retrieve our IP")
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278 iq_elt = client.IQ("get")
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279 iq_elt.addElement((NS_IP_CHECK, "address"))
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280 try:
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281 result_elt = yield iq_elt.send()
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282 address_elt = result_elt.elements(NS_IP_CHECK, "address").next()
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283 ip_elt = address_elt.elements(NS_IP_CHECK, "ip").next()
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284 except StopIteration:
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285 log.warning(
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286 u"Server returned invalid result on XEP-0279 request, we ignore it"
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287 )
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288 except StanzaError as e:
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289 log.warning(u"error while requesting ip to server: {}".format(e))
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290 else:
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291 # FIXME: server IP may not be the same as external IP (server can be on local machine or network)
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292 # IP should be checked to see if we have a local one, and rejected in this case
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293 external_ip = str(ip_elt)
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294 log.debug(u"External IP found: {}".format(external_ip))
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295 self._external_ip_cache = external_ip
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296 defer.returnValue(self._external_ip_cache)
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297
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298 # then with NAT-Port
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299 if self._nat is not None:
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300 nat_ip = yield self._nat.getIP()
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301 if nat_ip is not None:
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302 self._external_ip_cache = nat_ip
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303 defer.returnValue(nat_ip)
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304
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305 # and finally by requesting external website
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306 allow_get_ip = yield self._externalAllowed(client)
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307 try:
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308 ip = (yield webclient.getPage(GET_IP_PAGE)) if allow_get_ip else None
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309 except (internet_error.DNSLookupError, internet_error.TimeoutError):
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310 log.warning(u"Can't access Domain Name System")
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311 ip = None
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312 except web_error.Error as e:
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313 log.warning(
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314 u"Error while retrieving IP on {url}: {message}".format(
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315 url=GET_IP_PAGE, message=e
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316 )
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317 )
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318 ip = None
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319 else:
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320 self._external_ip_cache = ip
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321 defer.returnValue(ip)
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322
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323
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324 class IPPlugin_handler(XMPPHandler):
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325 implements(iwokkel.IDisco)
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326
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327 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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328 return [disco.DiscoFeature(NS_IP_CHECK)]
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329
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330 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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331 return []